Network Working Group R. Fielding Request for Comments: 2616 ...

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3.2.3 URI ComparisonWhen comparing two URIs to decide if they match or not, a clientSHOULD use a case-sensitive octet-by-octet comparison of the entireURIs, with these exceptions:- A port that is empty or not given is equivalent to the defaultport for that URI-reference;- Comparisons of host names MUST be case-insensitive;- Comparisons of scheme names MUST be case-insensitive;- An empty abs_path is equivalent to an abs_path of "/".Characters other than those in the "reserved" and "unsafe" sets (seeRFC 2396 [42]) are equivalent to their ""%" HEX HEX" encoding.For example, the following three URIs are equivalent:http://abc.com:80/~smith/home.htmlhttp://ABC.com/%7Esmith/home.htmlhttp://ABC.com:/%7esmith/home.html3.3 Date/Time Formats3.3.1 Full DateHTTP applications have historically allowed three different formatsfor the representation of date/time stamps:Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() formatThe first format is preferred as an Internet standard and representsa fixed-length subset of that defined by RFC 1123 [8] (an update toRFC 822 [9]). The second format is in common use, but is based on theobsolete RFC 850 [12] date format and lacks a four-digit year.HTTP/1.1 clients and servers that parse the date value MUST acceptall three formats (for compatibility with HTTP/1.0), though they MUSTonly generate the RFC 1123 format for representing HTTP-date valuesin header fields. See section 19.3 for further information.Note: Recipients of date values are encouraged to be robust inaccepting date values that may have been sent by non-HTTPapplications, as is sometimes the case when retrieving or postingmessages via proxies/gateways to SMTP or NNTP.
Fielding, et al. Standards Track [Page 20]RFC 2616 HTTP/1.1 June 1999All HTTP date/time stamps MUST be represented in Greenwich Mean Time(GMT), without exception. For the purposes of HTTP, GMT is exactlyequal to UTC (Coordinated Universal Time). This is indicated in thefirst two formats by the inclusion of "GMT" as the three-letterabbreviation for time zone, and MUST be assumed when reading theasctime format. HTTP-date is case sensitive and MUST NOT includeadditional LWS beyond that specifically included as SP in thegrammar.HTTP-date = rfc1123-date | rfc850-date | asctime-daterfc1123-date = wkday "," SP date1 SP time SP "GMT"rfc850-date = weekday "," SP date2 SP time SP "GMT"asctime-date = wkday SP date3 SP time SP 4DIGITdate1 = 2DIGIT SP month SP 4DIGIT; day month year (e.g., 02 Jun 1982)date2 = 2DIGIT "-" month "-" 2DIGIT; day-month-year (e.g., 02-Jun-82)date3 = month SP ( 2DIGIT | ( SP 1DIGIT )); month day (e.g., Jun 2)time = 2DIGIT ":" 2DIGIT ":" 2DIGIT; 00:00:00 - 23:59:59wkday = "Mon" | "Tue" | "Wed"| "Thu" | "Fri" | "Sat" | "Sun"weekday = "Monday" | "Tuesday" | "Wednesday"| "Thursday" | "Friday" | "Saturday" | "Sunday"month = "Jan" | "Feb" | "Mar" | "Apr"| "May" | "Jun" | "Jul" | "Aug"| "Sep" | "Oct" | "Nov" | "Dec"Note: HTTP requirements for the date/time stamp format apply onlyto their usage within the protocol stream. Clients and servers arenot required to use these formats for user presentation, requestlogging, etc.3.3.2 Delta SecondsSome HTTP header fields allow a time value to be specified as aninteger number of seconds, represented in decimal, after the timethat the message was received.delta-seconds = 1*DIGIT3.4 Character SetsHTTP uses the same definition of the term "character set" as thatdescribed for MIME:
Page 2: eferred to as "HTTP/1.1", and is an
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If the client is sending data, a se
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If the response could be unacceptab
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10.4.15 414 Request-URI Too LongThe
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10.5.5 504 Gateway TimeoutThe serve
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Fielding, et al. Standards Track [P
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Caching would be useless if it did
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Warning (but without removing any e
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If the user has overridden the basi
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in the past. This means that the re
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RFC 2616 HTTP/1.1 June 1999the time
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simple:response_is_fresh = (freshne
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match.In HTTP/1.1, a conditional re
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validators or strong validators. Cl
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- MAY send a weak entity tag instea
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Unless specifically constrained by
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warn-code 1xx, which are deleted ev
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for the associated entity, its enti
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- DELETE- POSTIn order to prevent d
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The Accept request-header field can
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image/jpeg = 0.5text/html;level=2 =
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Note: If the request does not inclu
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Accept-Ranges: bytesbut are not req
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containing an Authorization field,
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- Restrictions on what may be store
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improve privacy in some cases, we c
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must-revalidateBecause a cache MAY
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understand.For example, consider a
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new coding is known to be acceptabl
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14.14 Content-LocationThe Content-L
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Note: while the definition of Conte
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server SHOULD return them in the or
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Some origin server implementations
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Expires = "Expires" ":" HTTP-dateAn
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A client MUST include a Host header
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een modified since the date given b
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RFC 2616 HTTP/1.1 June 1999If none
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14.29 Last-ModifiedThe Last-Modifie
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MAY require that behavior be consis
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yte-ranges-specifier = bytes-unit "
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Content) instead of 200 (OK).- The
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The TE request-header field indicat
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a cache cannot determine from the r
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SHOULD NOT, by default, forward the
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this user agent behavior in mind.Re
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designers and implementors be parti
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strongly correlated to the membersh
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serious security considerations. Co
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The HTTP protocol has evolved consi
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Protocol -- HTTP/1.0", RFC 1945, Ma
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Implementation and Analysis", RFC 1
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University of California, IrvineIrv
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Notes:1) Additional CRLFs may prece
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full compliance with the MIME proto
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ead chunk-size and CRLF}read entity
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- understand any valid response in
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CREATE had a race that required an
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also needed to be a general header,
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